Having a bit of an issue with my dbxl and I'm quite new to all this but basically when I full throttle servo opens carb and when I close throttle it closes it fine, but when I full brake and then let of the brakes again it's reruns to a position where the carb is slightly open so everytime I brake when I stop braking the car shoots of and I'm not sure what's causing it just wondering if anyone could point me in the right direction, thanks. (Also don't know if this will help but I changed the servo horn I think it's called? The arm on top of the throttle/braking servo to a metal one could I have done something by accident while changing it to cause this?)